Exhaust Insulation Blanket

An exhaust insulation blanket is a removable thermal barrier engineered to fit around hot exhaust components and reduce the amount of heat released into surrounding areas.

Unlike rigid metal shields, exhaust blankets conform closely to complex shapes such as manifolds, turbo housings, downpipes, elbows, silencers and exhaust piping. This makes them particularly suitable for applications where high-temperature surfaces must be insulated without permanently modifying the exhaust system.

BSTFLEX manufactures custom exhaust blankets for automotive, diesel engine, generator, marine, heavy equipment and industrial exhaust applications.

Our exhaust thermal blankets can be designed from drawings, dimensional data, CAD geometry or physical samples and can be manufactured with different outer materials, insulation cores, inner liners and fastening systems according to operating temperature and installation environment.

For complete exhaust thermal management products, see the BSTFLEX Exhaust Heat Shield Insulation range.

What Is an Exhaust Insulation Blanket?

An exhaust insulation blanket is a flexible, multilayer thermal insulation assembly manufactured to fit directly around a hot exhaust component.

A typical construction may contain three functional layers:

Outer Layer

The outer layer protects the insulation system from abrasion, vibration, oil contamination, moisture and mechanical handling.

Depending on the application, common outer materials may include:

• high-temperature fiberglass fabric;

• silicone-coated fiberglass fabric;

• silica fabric;

• basalt fabric;

• stainless steel mesh;

• metallic foil or other reinforced constructions.

Thermal Insulation Core

The insulation core provides the primary resistance to conductive heat transfer.

Material selection depends on:

• operating temperature;

• required surface temperature reduction;

• allowable blanket thickness;

• installation clearance;

• vibration;

• service environment.

Different insulation densities and thicknesses can be used according to the thermal target.

Hot-Side Inner Layer

The inner surface faces the exhaust component.

It must withstand direct exposure to the hot exhaust surface and repeated thermal cycling.

Depending on the design, it may use:

• heat-resistant textile;

• stainless steel mesh;

• high-temperature fabric;

• metallic foil;

• reinforced composite construction.

These layers are sewn, fastened or mechanically assembled into a shaped blanket designed for the actual exhaust geometry.

Why Use an Exhaust Blanket?

The primary purpose of an exhaust blanket is to contain heat close to the exhaust component.

This can provide several practical benefits.

Reduce Radiant Heat

Exhaust manifolds, turbochargers and exhaust pipes can radiate substantial heat into an engine compartment or equipment enclosure.

A closely fitted insulation blanket reduces the direct thermal radiation reaching nearby components.

Lower External Surface Temperature

The outer surface of an insulated exhaust component can be significantly cooler than the bare exhaust surface.

This is particularly important in:

• generator rooms;

• marine engine compartments;

• industrial machinery;

• heavy equipment;

• enclosed engine systems;

• maintenance-access areas.

Protect Nearby Components

Nearby components may include:

• wiring harnesses;

• hoses;

• fuel lines;

• hydraulic lines;

• sensors;

• body panels;

• plastic parts;

• batteries;

• electronic control units.

Reducing radiant heat exposure can improve the thermal environment around these components.

Improve Heat Containment

Keeping exhaust heat closer to the exhaust stream can reduce heat accumulation in the surrounding engine compartment.

This is especially important where airflow is limited.

Allow Easier Maintenance

One major advantage of a removable exhaust blanket is serviceability.

A blanket using hooks, springs, wire lacing or other removable fastening systems can be taken off for inspection and reinstalled after maintenance.

This is often preferable to permanently wrapping an exhaust component.

Exhaust Blanket vs Exhaust Heat Shield

An exhaust blanket and a metal exhaust heat shield do not perform exactly the same function.

Feature	Exhaust Insulation Blanket	Metal Exhaust Heat Shield
Main function	Contain and insulate heat	Reflect and block radiant heat
Installation	Directly around component	Usually separated by an air gap
Flexibility	High	Low
Complex geometry	Excellent	Requires forming
Removability	Excellent	Good
Custom prototype	Easy to develop	Requires forming tooling or fabrication
Pipe insulation	Excellent	Application dependent
Manifold insulation	Excellent	Good
OEM underbody shielding	Limited	Excellent
Thickness	Typically higher	Typically lower

For many exhaust systems, both technologies may be used together.

A turbocharger may use an insulation blanket while the vehicle floor above it uses a formed stainless steel or aluminum heat shield.

Exhaust Blanket vs Exhaust Wrap

Exhaust wrap is wound around a pipe or header in overlapping layers.

An exhaust blanket is manufactured as a shaped component and installed around a specific geometry.

Exhaust Wrap

Best suited for:

• continuous exhaust tubing;

• headers;

• simple bends;

• aftermarket applications;

• applications where permanent wrapping is acceptable.

Exhaust Insulation Blanket

Best suited for:

• turbochargers;

• manifolds;

• elbows;

• silencers;

• large exhaust pipes;

• generators;

• marine engines;

• industrial equipment;

• components that require regular maintenance.

A blanket is usually the preferred approach where the insulation must be removed repeatedly without destroying the insulation system.

High Temperature Exhaust Blanket Materials

The temperature capability of an exhaust blanket depends on the complete assembly rather than a single material.

Important factors include:

• hot-side fabric;

• insulation core;

• outer fabric;

• sewing thread;

• fasteners;

• blanket thickness;

• air movement;

• exhaust surface temperature;

• exposure duration.

Fiberglass-Based Exhaust Blankets

Fiberglass constructions are widely used for moderate to high-temperature exhaust insulation.

They provide:

• good flexibility;

• practical manufacturing cost;

• broad availability;

• strong suitability for custom shapes.

They are commonly used for exhaust pipes, generator systems and industrial exhaust components.

Silica Exhaust Blankets

High-silica materials are preferred where higher temperature capability is required.

They are often used around:

• manifolds;

• turbochargers;

• high-output diesel exhaust systems;

• industrial exhaust systems.

Basalt Exhaust Blankets

Basalt-based textiles combine heat resistance with mechanical flexibility.

They are commonly used in automotive and performance exhaust insulation.

Metallic Outer Layers

Stainless steel foil, mesh or other metallic layers may be used where additional:

• abrasion resistance;

• oil resistance;

• mechanical durability;

• radiant heat control

is required.

Custom Exhaust Blankets

Standard rectangular insulation does not work effectively on complex exhaust geometry.

A custom exhaust blanket should follow the component closely while still allowing practical installation and removal.

BSTFLEX can manufacture custom blankets for:

• exhaust manifolds;

• turbochargers;

• exhaust pipes;

• downpipes;

• elbows;

• flex sections;

• catalytic converters;

• DPF housings;

• mufflers;

• silencers;

• marine exhaust risers;

• generator exhaust systems.

Custom development can begin from:

• technical drawings;

• CAD files;

• dimensional sketches;

• photographs;

• templates;

• physical samples.

Custom Fastening Systems

The fastening method is an important part of exhaust blanket design.

Options may include:

• hooks and springs;

• stainless steel wire lacing;

• buckles;

• straps;

• snap fasteners;

• custom metal hardware;

• sewn attachment points.

The fastening system should tolerate vibration and thermal cycling while allowing convenient removal.

Exhaust Pipe Insulation Blankets

An exhaust pipe insulation blanket is designed for straight pipe sections, flanges, bends and larger exhaust tubing.

Unlike exhaust wrap, removable pipe blankets can be segmented.

This makes them suitable for:

• generator exhaust lines;

• diesel engine exhaust pipes;

• marine engine systems;

• industrial exhaust piping;

• stationary machinery.

Individual sections can be removed during inspection without disturbing the entire insulation system.

Exhaust Manifold Blankets

Exhaust manifolds generate concentrated heat close to the engine.

A fitted manifold blanket can help reduce heat transfer toward:

• wiring;

• hoses;

• intake systems;

• firewall areas;

• engine covers;

• electrical components.

BSTFLEX manufactures shaped manifold insulation, including products such as the Titanium Header Manifold Blanket and Turbo Manifold Blanket.

Turbocharger Insulation Blankets

Turbochargers operate in an extremely concentrated high-temperature zone.

A turbo insulation blanket is designed to fit around the turbine housing while avoiding interference with:

• actuator components;

• oil lines;

• coolant lines;

• flanges;

• mounting hardware.

Turbo blanket design must account for both thermal performance and accurate fit.

Exhaust Elbow Blankets

Elbows are difficult to insulate using flat materials because the insulation must follow a curved three-dimensional shape.

A formed blanket improves coverage and reduces open gaps around the bend.

BSTFLEX supplies the Thermal Insulation Elbow Blanket for this type of application.

Downpipe Insulation Blankets

Turbo downpipes can be positioned close to transmission components, wiring and surrounding body structures.

A custom Thermal Downpipe Blanket can provide localized heat containment while remaining removable.

Diesel Exhaust Blankets

Diesel engines are common in:

• trucks;

• buses;

• agricultural equipment;

• construction machinery;

• generators;

• marine vessels;

• industrial power systems.

A diesel exhaust blanket can be used around:

• manifolds;

• turbochargers;

• exhaust pipes;

• silencers;

• elbows;

• DPF housings.

Because these engines often operate for long periods, insulation durability and fastening reliability are critical.

Generator Exhaust Blankets

Generator systems frequently operate inside enclosed housings.

Heat radiated from exhaust components can significantly increase the internal temperature of the enclosure.

A generator exhaust insulation system may include blankets for:

• manifolds;

• turbochargers;

• exhaust pipes;

• flexible connectors;

• silencers;

• elbows.

Removable blanket construction is particularly suitable for generator OEMs because the exhaust system often requires periodic service.

Marine Exhaust Blankets

Marine engine rooms have limited space and contain many heat-sensitive systems.

A marine exhaust blanket can be designed for:

• diesel exhaust manifolds;

• turbochargers;

• exhaust risers;

• dry exhaust piping;

• generator exhaust;

• marine silencers;

• exhaust elbows.

The outer construction should also take into account moisture, vibration and the marine operating environment.

Exhaust Muffler Blankets

Mufflers and silencers can generate significant external surface temperature.

An exhaust muffler blanket may be used when the muffler is installed close to:

• vehicle floors;

• equipment panels;

• operator areas;

• wiring;

• fuel systems.

For applications requiring internal acoustic packing rather than external thermal insulation, see the BSTFLEX Muffler Packing product range.

How to Specify a Custom Exhaust Blanket

For accurate quotation and design, provide as much application information as possible.

Component Geometry

Provide:

• outside diameter;

• overall length;

• bend angles;

• flange dimensions;

• mounting brackets;

• sensor positions;

• pipe connections.

Operating Temperature

Provide both:

• normal continuous temperature;

• maximum expected temperature.

Required Insulation Thickness

Thickness should be based on:

• required thermal reduction;

• available installation space;

• blanket construction.

Required Outer Surface Temperature

If a specific surface temperature target is required, include the target and operating conditions.

Service Environment

Identify whether the blanket will be exposed to:

• oil;

• fuel;

• water;

• salt spray;

• abrasion;

• vibration;

• outdoor weather;

• frequent maintenance.

Quantity

Specify:

• prototype quantity;

• annual quantity;

• batch size.

This allows the manufacturing method and material configuration to be optimized for the project.

Exhaust Blanket Design Considerations

A successful exhaust blanket requires more than simply increasing insulation thickness.

Important design factors include:

Fit

Large air gaps between the blanket and component can alter thermal performance and may create installation problems.

Seams

Seams should be positioned away from the highest heat zones where possible.

Openings

Sensor ports, brackets, flanges and pipe connections must be accurately positioned.

Thermal Bridges

Fasteners and metal components can conduct heat through the insulation system.

Their placement should therefore be considered during design.

Vibration

Blankets used on engines must withstand repeated vibration without excessive movement or abrasion.

Maintenance

The blanket should be removable without damaging nearby components.

Typical Exhaust Blanket Applications

BSTFLEX exhaust thermal blankets can be used in:

Automotive

• exhaust manifolds;

• turbochargers;

• downpipes;

• mufflers;

• performance exhaust systems.

Commercial Vehicles

• diesel exhaust pipes;

• turbochargers;

• aftertreatment systems;

• engine compartments.

Generator Sets

• exhaust manifolds;

• turbochargers;

• exhaust piping;

• silencers.

Marine

• dry exhaust systems;

• marine diesel engines;

• exhaust risers;

• generator exhaust systems.

Heavy Equipment

• construction machinery;

• mining equipment;

• agricultural machinery;

• material handling equipment.

Industrial Systems

• stationary engines;

• process exhaust piping;

• high-temperature ducts;

• exhaust silencers.

Exhaust Blanket Selection Guide

Application	Recommended Blanket Type
Turbocharger	Shaped turbo insulation blanket
Exhaust manifold	Custom manifold blanket
Straight exhaust pipe	Removable pipe insulation blanket
Exhaust elbow	Formed elbow blanket
Turbo downpipe	Shaped downpipe blanket
Generator exhaust	Segmented removable insulation blanket
Marine exhaust	Moisture-resistant removable blanket
Muffler	Large-format insulation blanket or metal heat shield
Diesel engine	High-temperature vibration-resistant blanket

Frequently Asked Questions

What is an exhaust insulation blanket?

An exhaust insulation blanket is a flexible multilayer thermal barrier fitted around an exhaust component to reduce external heat transfer and surface temperature.

What is an exhaust blanket made from?

Construction varies by temperature and environment. Typical materials include fiberglass, silica, basalt, stainless steel mesh and high-temperature insulation cores.

Are exhaust blankets removable?

Most custom exhaust blankets can be designed with removable fastening systems such as hooks and springs, wire lacing or straps.

Can exhaust blankets be made for irregular shapes?

Yes. Custom blankets can be manufactured for manifolds, turbochargers, elbows, silencers, flanges and other complex exhaust components.

Are exhaust insulation blankets suitable for diesel engines?

Yes. They are widely used on diesel manifolds, turbochargers, exhaust pipes, generators, marine engines and heavy equipment.

Can BSTFLEX manufacture from a physical sample?

Yes. Development can be based on drawings, CAD files, dimensions, photographs or physical samples.

Is an exhaust blanket the same as exhaust wrap?

No. Exhaust wrap is wound directly around tubing, while a blanket is manufactured as a removable shaped insulation component.

Can insulation thickness be customized?

Yes. Blanket thickness can be selected according to operating temperature, available space and required thermal performance.

Custom Exhaust Insulation Blanket Manufacturer

BSTFLEX manufactures high-temperature exhaust insulation products for OEM manufacturers, exhaust-system suppliers, engine builders, distributors and industrial equipment manufacturers.

Our capabilities include:

• custom geometry;

• prototype development;

• different insulation thicknesses;

• multiple outer materials;

• custom fastening systems;

• sample-based development;

• drawing-based manufacturing;

• production quantities;

• private-label and OEM packaging.

For applications requiring a complete combination of blankets, metallic shields, pipe insulation and radiant barriers, visit the BSTFLEX Exhaust Heat Shield Insulation product category.

For quotation, provide component dimensions or drawings, operating temperature, application environment, required quantity and any required external surface-temperature target.

Request an RFQ for a custom exhaust insulation blanket engineered for your exhaust system.